ORIGIN AND DEPOSITIONAL ENVIRONMENT OF ORDOVICIAN GYPSUMS IN LINFEN,SHANXI PROVINCE

Wang Zezhong; Zhai Yonghong

doi:10.11743/ogg19920309

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ORIGIN AND DEPOSITIONAL ENVIRONMENT OF ORDOVICIAN GYPSUMS IN LINFEN,SHANXI PROVINCE
Vol. 13, Issue 3, Pages: 314-321(1992)
Online First：25 September 1992，

Published：1992
DOI： 10.11743/ogg19920309
稿件说明：

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DOI：

Wang Zezhong, Zhai Yonghong. ORIGIN AND DEPOSITIONAL ENVIRONMENT OF ORDOVICIAN GYPSUMS IN LINFEN,SHANXI PROVINCE[J]. 1992, 13(3): 314-321. DOI： 10.11743/ogg19920309.

摘要

山西临汾奥陶系石膏岩可分为原地沉淀型、异地沉积型、成岩交代型和脉状充填型四种。原地沉淀型石膏岩形成于浅水台地地势相对低洼的盐湖中;成岩交代型石膏岩形成在浅水台地地形相对隆起的部位

交代作用发生于大气淡水渗流带;异地沉积型石膏岩的形成环境介于低洼的盐湖和较高的隆起之间;脉状充填型石膏岩是充填在白云岩中的石膏脉

其形成与石膏-硬石膏相互转化时

脱水产生异常高压和吸水膨胀有关。

Abstract

The Ordovician gypsums in Linfen

Shanxi Province

can be divided into four types

namely autochthonous precipited

allochthonous deposited

diagenetic replaced and veinfilledtypes.Theautochthonousgypsum includinglaminated gypsum

banded gypsum and massive gypsum

which were formed by chemical precipitation in saline water depressions of shallow platform.The diagenetic replaced gypsum contains stromatolitic gypsum

oolitic gypsum and nodular gypsum which were formed in the uplift of the shallow platform and occurred in vadose zone during the penecontemporaneous stage.The allochthonous de-posited gypsum includes rudaceous gypsum and edgewise gypsum formed in places be-tween the depressions and the uplifts.The vein-filled gypsum was formed in transforma-tion process of gypsum and anhydrite related to abnormal high pressure resulted from de-hydration and the absorbing expansion.